Mining-machine



C. E. DAVIS.

MINING MACHINE.

APPLICATION FILED APR. I5, 1912. RENEWED NOV. 12,1919.

1 ,344, 20 1 Patented June 22, 1920.

2 SHEETSSHEET I.

A6 60 7* 72gb 2 C. E. DAVIS.

MINING MACHINE.

APPLICATION FILED APR. 15, 1912. RENEWED NOV. 12,1919.

Patented June 22, 1920.

2 SHEETS-SHEET 2.

javemaar (Zar/ep .27 73 1 UNITED STATES.

PATENT OFFICE.

CHARLES E. DAVIS, OF CHICAGO, IIJLINOIS, ASSIGNOR 'IO GOODMANMANUFACTURIN COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MINING-MACHINE.

Specification of Letters Patent. Patented June 22, 1920. Originalapplication filed October 6, 1910, Serial No. 585,549

. Divided and this application filed April 15,

1912, Seria1 No. 690,697; Renewed November 12, 1919.- Serial No.337,825.

To all whom it may concern:

Be it known that I, CHARLES E. DAVIS, a

citizen of the United States, residing at Chiuseful Improvement inMining-Machines, of

"H. of Fig. 1.

which the following is a specification.

This invention relates to improvements in mining machines and has forits object to provide a new andimprovedmachine of this description. Theinvention is illustrated in the accompanying drawings, wherein1 Figure lis a plan View of a mining machine embodying the invention.

Fig. 2 is a side elevation of the machin shown in Fig. 1.

Fig. 3 is a sectional view taken on line Fig. 4 is a sectional viewtaken on line 14 of Fig. 3.

Like numerals refer to like out the several figures.

This application is a division of my rior application, Serial No.585,549, filed ctober 6, 1910. The mining machine herein shown is of atype having a forwardly projecting cutter arm 1 provided with an endlesscutter chain 2 which passes around a parts throughsprocket wheel 3 atthe front end of the cut-' motor 5. The cutter arm is fixed withrelation to the frame carrying the motor and the entire machine is movedduring the cutting safety device shown in the drawing 1s proprocess. Theentire machine is first moved longitudinally so as to make the first cutor entry into the coal and is then moved laterally along the face of thecoal. In the device shown, the machine is fed by means of a flexiblepower transmitting device 6 which passes over a drum 7 operated by themotor and which is connected to a stationary part. \Vhcn it is desiredto make the first'cut or entry into the coal, the machine is in theposition shown in Fig. 1, and the power transmitting device 6 isconnectedJto a stationary part 8 arranged in such position as cutters ofthe chain engaging the coal also tend to produce a lateral movement ofthe cutter arm. In order to prevent this lateral movementfl provide thecutter arm with two guides 9 and 10. Between these guides is provided aguiding device having a guiding part 11 and a shoe 12. The guidingpart-11 is provided with means for fixing it in position, such as forexample, the jack 13, which is adapted to be brought into engagementwith the face of the coal or other stationary part. It will thus be,seen that when the 'ack is tightened, the guidingpart 11 is held rigidlyin position, the shoe 12 engaging the ground or floor. The machine canthen be moved forward but will be held against lateral movement. When amachine 0 this type as ordinarily constructed is first started in itsforward cut, practically the entire cutter chain is exposed so as to en-;danger anyone near the machine. It has also been found that as themachine is started into the coal, it often strikes a hard spot and isthrown entirely away from the face the operator or any other person nearthe machine. Since the cutter arm is rigid with the frame of themachineand is pushed forward into the coal, it will be seen that any guard usedmust be one which will gradually move out of the way as the cutter armenters the coal. The particular form of guard or back into the frame asthe. cutter chain is moved forward, the guard finally taking theposition as shown in Fig. 3. As herein shown, the cross bar 16 isprovided with a suitable opening'for the guiding part 11 attached to theshoe 12. Some-means is preferably rovided for holding the guard frame inits all extended positionwhile the machine is being moved about. Asherein a shown, the 'guidin part 11 which has a part passing through t ehole of the cross bar 16 is provided with a pivoted latch 18 adapted toengage the cutter arm so as to lock the guiding frame and cutter armtogether when desired; The latch 18 is provided with an upwardly turnedend 19, and the jack has a beveled face 20 which engages the upturnedend 19 so as to move the latch 18 to automatically disengage the parts,when'the jack 13 is placed in position. In operating the device, thejack 13 is placed in position and its end brought into contact with theroof or side wall or some other fixed point and the jack tightenedso asto hold the cutter frame against lateral movement. The machine is againstarted and the entire machine is moved forward, the cutter chainengaging the coal and gradually cutting it away so that the cutter chainand cross bar project into the coal. The guard being fastened to thefixed shoe is held against forward movement and gradually slides alongthe guides 17 back into the frame of the machine to the position shownin Fig. 3. WVhen the full forward movement is completed, the jack 13 isremoved and the shoe 12 placed upon the support or base 21 of themachine as shown in Fig. 3. It will be seen that by means of thisdevice, the cutter chain is properly guarded while the cutters areexposed, so as to prevent injury to anyone near the machine. Thedownwardly projecting parts of the side pieces prevent the cutters fromstriking the operator or any other person even if he should lean againstsaid side pieces. It will be noted that in the present case, there is amoving member with a cut-- ting device mounted on said moving member anda power device mounted thereon, and that the guard for the cuttingdevice is. also mounted on said moving member, there being means forremoving said guard from the cutting device progressively as the cuttingdevice enters the substance beingcut.

I claim:

1. A mining machine comprising a cutter arm, a cutter chain associatedtherewith, a chain guard associated with said chain, a support for saidchain guard and a slidin connection between said chain guard an saidsupport said mining machine being supported upon the mine floorindependently of the chain guard.

2. A mining machine comprising a frame, a cutter chain, a chain guardtherefor slidably engaging said frame, said frame provided with areceiving space for said guard, said guard adapted to slide back intosaid receivmg space as the chain moves forward,

the mining machine being supported on the mine floor. independently ofthe chain guard.

. 3. A mining machine-comprising a frame, a cutter armconnected-therew1th, a cutter chain associated with said cutter arm, achain guard comprising two side pieces,

- independently of the chain guard.

at. A mining machine comprising a frame, a cutter arm rigidly connectedtherewith a cutting chain on said cutter arm, a guard for said chainmovably connected at one end with said frame, the other end adapted toengage a fixed part so that when the machine is moved forward, thecutters of the cutter chain will be gradually moved out of theprotection of the guard, said mining machine being supported upon themine floor independently of the chain guard.

5. A mining machine comprising a frame, a cutter arm connectedtherewith, a cutting 35 chain associated with said cutter arm, anoperating mechanism therefor, a guard for said cutter chain movablyconnected with the cutter arm and means separate from said operatingmember for connecting said guard with the cutter arm under predeterminedconditions so as to hold them against a relative movement, said miningmachine being supported upon the mine floor independently of the chainguard.

6. A mining machine comprising a frame, a cutter arm fixed thereto andprojectin outwardly therefrom, a cutter chain carrie by said arm, asliding'chain guard for said 0 ain, said chain guard adapted to be moved,100 with relation to said frame under prede terminedconditions, saidminin machine bein supported upon the mine oor indepen ently of thechain guard.

7. A mining machine comprising a moving member, a cutting device mountedthereon, a power device also mounted on said moving member, a guard forsaid cutting device, said guard movably mounted, said guard adapted touncover said cutting device progressively as the cutting device entersthe substance bein cut, said mining ma chine being supporte upon themine floor independently of the chain guard.

8. A mining machine comprising a frame, 116 a cutter arm connectedtherewith, a cutter chain mounted on said cutter arm, a chain guard forsaid cutter chain comprising side pieces slidably connected with saidframe, a cross connection between said side pieces, 120 guides on saidframe for said side pieces, said frame provided with receiving spacesinto which said side pieces are received as the cutting chain enters thematerial being out, said mining machine being supported upon the minefloor independently of the chain guard.

9. A mining machine comprising a frame,

a cutter arm connected therewith, a cutting chain associated with saidcutter arm, a,

- ed on said frame, and means for preventchain ard.

ing relative movement'between said guard and said frame underpredetermined conditions, said minin machine being supported upon themine oor independently of the 10. mining machine comprising a frame,acutter arm connected therewith, a cutting chain associated with saidcutter arm, a guard for said cutter chain, located above said cutterarmand movably mounted on said frame, said having a relatively slidingmovement along the top of said cutter arm and the frame to which thecutter arm is connected, said mining machine being supported upon themine floor independently of the chain guard.

11. A mining machine comprising a frame, a cutter arm projectingtherefrom, a cutter chain associated with said cutter arm, a guard forsaid cutter chain, comprising two separated side pieces slidablysupported upon said framehaving portions located above said cutter arm,a crosspiece located above the cutter arm connectlng the side uard whenthe cutter arm is moved into ,t e material to be cut,-

pieces together, the ends of theside pieces projectlng into a receivingspace in said frame, said mining machine being supported upon the minefloor independently of the chain guard.

12. A' mining machine comprising a frame, a cutter armprojectingtherefrom, a cutting chain associated with said cutter arm,cutters on said cutter chain, a guard for said cutter chain, comprisingtwoside pieces each side piece having two portions, one 0 which projectsdownwardly in front of the chain and the other of which projectslaterally over the top of the ends of the cutters on the chain, acrosspiece connecting the two side pieces together, and guides on saidframe along which said side pieces move when the guard is moved, saidmining machine being supported upon the mine floor independently of thechain guard.

Signed at Chicago, county of Cook, and

State of Illinois, this 8th'day of April, 1912.

CHARLES E. DAVIS.

.' Witnesses:

MINNIE M. LINDENAU, DENIE A. WALTER.

